How can I bring qtcurve style back on settings window?

I'm experiencing a problem, curreently I'm using KDE 4.8 on Ubuntu 11.10, everythig works ok, but from about a month and a half the option to choose QtCurve from the system settings window is gone, the qtcurve packaged are installed and I know for sure that is something related to my user profile, since I've just tried with another "clean" user and the option is right there. BTW the window decoration option is still there, the problem is only with the widget style.

I hope you can give me a hint on how to solve this whitout wiping out all of my configurations.

How do you like Plasma 5? The best KDE Desktop ever. Definitely a nice improvement. Not decided yet. Haven't tried it yet. I do not like some of the changes. KDE is taking the wrong way. I am still sticking with KDE 3.5. I have no opinion, but wanted to vote anyway.

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